Medical coding is the transformation of narrative descriptions of diseases; injuries and health care procedures into numeric or alphanumeric designations (that is, code numbers). The code numbers or detailed in order to accurately describe the diagnoses (that is, what is wrong with the patient) and the procedures performed to test or correct these diagnoses.

Medical billing is the process by which doctors and hospitals receive payment from health insurance companies .It also involves resolving any disputes and following up on claims that have been delayed or rejected. Medical billing is a complex series of procedures that require a great deal of time by skilled professionals.